he'll / heal / heel are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
he'll: NA
heal: (verb) get healthy again.
heel: (noun) the bottom of a shoe or boot; the back part of a shoe or boot that touches the ground and provides elevation. (noun) the back part of the human foot. (noun) one of the crusty ends of a loaf of bread. (noun) the lower end of a ship's mast. (noun) (golf) the part of the clubhead where it joins the shaft. (verb) follow at the heels of a person. (verb) perform with the heels. (verb) strike with the heel of the club. (verb) put a new heel on.
he'll: hh·IY·l
heal: hh·IY·l
heel: hh·IY·l
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)